* Package:    dev-ruby/posix-spawn-0.3.13
 * Repository: gentoo
 * Maintainer: ruby@gentoo.org
 * USE:        abi_x86_32 elibc_glibc kernel_linux ruby_targets_ruby23 userland_GNU x86
 * FEATURES:   preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
 * Running unpack phase for all ...
 * Unpacking .gem file... ...
 [ ok ]
 * Uncompressing metadata ...
 [ ok ]
 * Unpacking data.tar.gz ...
 [ ok ]
>>> Source unpacked in /var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work
>>> Preparing source in /var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work ...
 * Running prepare phase for all ...
 * Running source copy phase for ruby23 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work ...
 * Running configure phase for ruby23 ...
creating Makefile
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work ...
 * Running compile phase for ruby23 ...
make --jobs 5 --load-average 7.95 V=1 -Cext 
make: Entering directory '/var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work/ruby23/posix-spawn-0.3.13/ext'
i686-pc-linux-gnu-gcc -I. -I/usr/include/ruby-2.3.0/i686-linux -I/usr/include/ruby-2.3.0/ruby/backward -I/usr/include/ruby-2.3.0 -I. -D_FILE_OFFSET_BITS=64  -fPIC -O2 -pipe -march=pentium4m -mtune=pentium4m -fno-strict-aliasing -fPIC -Wall   -o posix-spawn.o -c posix-spawn.c
posix-spawn.c: In function ‘posixspawn_obj_to_fd’:
posix-spawn.c:64:14: warning: implicit declaration of function ‘rb_fix2int’ [-Wimplicit-function-declaration]
    fd = (int)rb_fix2int(obj);
              ^~~~~~~~~~
rm -f posix_spawn_ext.so
i686-pc-linux-gnu-gcc -shared -o posix_spawn_ext.so posix-spawn.o -L. -L/usr/lib -L. -Wl,-O1 -Wl,--as-needed -fstack-protector -rdynamic -Wl,-export-dynamic -Wl,--no-undefined    -lruby23  -lpthread -lgmp -ldl -lcrypt -lm   -lc
posix-spawn.o: In function `.L24':
posix-spawn.c:(.text+0x1b1): undefined reference to `rb_fix2int'
collect2: error: ld returned 1 exit status
make: *** [Makefile:256: posix_spawn_ext.so] Error 1
make: Leaving directory '/var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work/ruby23/posix-spawn-0.3.13/ext'
 * ERROR: dev-ruby/posix-spawn-0.3.13::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=dev-ruby/posix-spawn-0.3.13::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-ruby/posix-spawn-0.3.13::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/dev-ruby/posix-spawn-0.3.13/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-ruby/posix-spawn-0.3.13/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work/ruby23/posix-spawn-0.3.13'
 * S: '/var/tmp/portage/dev-ruby/posix-spawn-0.3.13/work/ruby23/posix-spawn-0.3.13'
!!! When you file a bug report, please include the following information:
GENTOO_VM=  CLASSPATH="" JAVA_HOME=""
JAVACFLAGS="" COMPILER=""
and of course, the output of emerge --info =posix-spawn-0.3.13